Dial-operating mechanism



z. P. CANDEE ET Al.

um, OPERATING, mcHANIsM Filed gun}; A, 192 1 s Sheets-Sheet 1 I a")? fang? {has Z. P. CANDEE ET AL DIAL OPERATING MECHANISM Filed Jiune 4; i921 -s- Sheets-Sheet 2 Oct- 12,1926, 1,603,023 z. P. CAND EE ET AL -DIAL'"0PE-RATING MECHANISM Filed Jung 4, 1921 3 SQeets-Sheet 5 Patented Oct. 12, 1926. j

UNITED STATES PATENT OFFICE.

ZENAS P. CANDEE 'AND JESSE B. BURTON, F WATERBURY, CONNECTICUT, ASSIGNORS TO THE WATERBURY FARREL FOUNDRY AND 'M'ACHINE COMPANY, OF WATER- BURY, CONNECTICUT, A CORPORATION OF CONNECTICUT.

DIAL-OPERATING MECHAN ISM.

vAp zolication filed .Tune 4, 1921. Serial No. 475,170.

This invention relates to new and useful improvements in dial operating mechanisms relating more particularly to ratchet dials associated with power presses, although not necessarily limited thereto. 2

It is the object of this invention, among other things, to provide mechanisms where- .by the dial may be operated at a speed higher than has heretofore been considered 1 good practice; to reduce the wear upon the pawl and notches of the dial and thereby eliminate lost motion and inaccuracies in the movement and positioning of the dial; to provide means whereby the parts may be adjusted to accommodate dials having a variable number of notches; to provide for a relative adjustment of all of the pawl operating parts as wellas to so-design the same that they may be economically constructed and :readilyassembled.

To these and other ends our invention consists in the dial operating mechanism, rhaving certain details of construction and combinationsof parts as will be hereinafter described and more'particularly pointed out in the claims.

Referringto the drawings in which like numerals of reference designate like ,parts in the several figures,

Figure 1 is a side elevation of our improved mechanism with so much ofa power press with whichitiis connected-asis necessary to describethe operationathereof;

Figure 2isa plan view thereof; and

Figure 3 is a front elevation.

Ratchet dials are frequently used upon powerpresses of a wellknowntypeand as such, are common and old in theart. We have, therefore, shown our improved mechanism as associated withthistypeof machine, although it is obvious that itmay be adapted to other forms and structures of machines, if desired.

In the drawings, 10 designates the frame of a power press having a base portion 11 and two upright portions 1212 between which is agate 13 reciprocatedfrom acrank shaft 14 through a connection 15. Attached to the base ortion .llis the diebed 16 n1ovably secure thereto by the bolts 17.

The partsabove describedare of a well known design and operation, and constitute nopart of our present invention.

Fixed to one side of thebase portion 11 is aslide bracket 18 with av lug .19 connected therewith within which is a stud 20 having .a dial bed 21 pivotally mounted therein. This dial bed 21 is-secured in its innermost or operative position by a stud 22 which passes through a slot 23 and is threaded into the base'portion 11. Rotatably mounted upon a stud 24 fixed in the dial bed 21 is a dial 25 which is frictionally held against its support by a bell friction 26. The dial is provided with the required number of" peripheral notches 27 and openings 28 therethrough fo the operating tools, the shape or design of which is not material to this invention. They register, however, when the dial is at rest with a punch or other tool 29 connected with the gate 13.

A stop screw 30 threadedthrough a stud 31 in the underside of the dial bed 21abuts against the front edge of the base portion 11 and thus limits the inward position of the dial without adjustment. The dial moved outwardly and the adjustment of the operating tools thereby facilitated by merely loosening the stud-22, and swinging the dial bed 21 upon the stud 20. It is're .80 turned inthe same manner, its inner position being limited-by the stop screw 30 and is then secured in position by manipulation of the stud 22.

"Movably mounted in the uprights 32 of the slide bracket 18 is the slide 33 being .held against lateral movementthereinby the caps 34. Fixed to the inner side of the slide 33 by the pin 57 and screw 58 is apawl carrier 35 to which a pawl 36 is pivotally connected by the pintle 37 A spring 38 between the pawl and pawl carrier exerts its tension so as to maintain the outer end of the pawl in contact with the periphery of the dial 25.

The inner face 39 of the pawlcarrier35 slides against the outer upright 32 so as to ,provide a rigid support therefor and the pawl 36 during its operation. This results in flexibility-to the pawl and substantial rigidity to its support throughout its entire movement, the carrier being "long enough to maintain constant contact with the upright 32. V 0

Movement is impartedto theslide 33-from :the crank shaft 14 by the following mechanism. Secured .to the outer end of the crank shaft 14. is a crank plate 40 having a pin tl therein carrying the slide 42 that is movable within the slot 43 in the rock lever 44: journaled upon the stud lined in the frame 10. A second rock lever is journaled upon the stud 4'? fixed in the frame 10 and connected to the rock lever 14i: through the link 4-8. This link is connected with the rock lever 4:6 by the stud i9 and to the rock lever at by the stud 50 and shearing pin 51, which is of sullicient strength to operate the parts under normal conditions, but if conditions become abnormal, such as the breaking of the tools or jamming of the machine, the pin will shear and thus prevent damage to the machine.

011 the outer end of the slide 3?) is a stud. 52 that is adjustable thereon by means of the nuts 53. Connecting said stud 52 with a stud 5 f adjustable within the slot within the rock lever 46 is a link Rotation of the crank plate 4-0 imp-arts movement to the rock lever it and through the link 48 to the rock lever and by the link connection 56 a reciprocatory movement is given to the slide 33 and the pawl connected therewith.

In Figure 2 the pawl is shown by full lines in its forward position and after an intermittent rotation has been transmitted to the dial 25, and its rearmost position is shown by broken lines.

It is preferable in the adjustment of the stroke of the slide 33 that the center of the pintle 37 move an equal distance each side of the center of the dial. By this positioning and movement of the pawl, the wear upon the edges of the peripheral notches 27 and upon the end of the tooth of the pawl 36 is reduced to the absolute minimum. In fact, there is practically no wear at these points.

The timing of the mechanism is such that the pawl36 takes up any lost motion during the first part of its forward stroke and engages one of the notches 27 at a comparatively low speed.

Minor changes and alterations may be made within our invention, aside from those herein suggested, and we would therefore have it understood that we do not limit ourselves to the exact construction herein shown and described but claim all that falls fairly within the spirit and scope of the appended claims.

Having described our invention, what we claim as new and desire to secure by Letters Patent, is:

1. In a dial operating mechanism. notched dial, a slide, a guide for the slide, a pawl carrier connected to the slide and offset therefrom and having its rear face in slidable engagement with the guide, a pawl movably connected with the carrier, and means to reciprocate the slide and thereby the pawl so that the latter moves in a straight path and through equal distances on opposite sides of a line drawn at right angles to such path and intersecting the dial axis, the pawl being of such length and bearing such relation to the dial to have a path of contact with the dial whereby the end of the pawl remains in the dial notches in substantially the same relative position throughout its engagement therewith.

2. In a dial operating mechanism, a notched dial. a slide a guide for the slide, a pawl carrier connected at one end to the slide and offset therefrom and having the central part of its rear face in slidable engagement with the guide, and a pawl on the opposite end of the carrier.

in a dial operating mechanism, a notched dial, a slide, a guide for the slide, an elongated pawl carrier connected at one end to the slide and having the central part of its rear face in slidable engagement with the guide, and a pawl on the opposite end of the slide, said guide being arranged so that upon extreme idling movement of the slide, the pawl is disposed beyond the guide.

l. in a dial operating mechanism, a notched dial, a slide, a pawl carrier connected at one end to the slide and having a part offset from the slide, a fixed element slidably engaging the central part of the rear face of said ofl'set part of the carrier, and a pawl on the opposite end of the carrier.

5. In mechanism of the character described, a dial, a slide, a pawl connected therewith and having peripheral engagement with said dial, a shaft, a rock lever actuated from said shaft, a second rock lever, a shearing connection between said levers whereby motion is transmitted to the latter from the former and an adjustable connection between said second rock lever and said slide.

6. In mechanism of the character described; a dial; a slide; means for imparting a reciprocatory movement in a straight line to the slide; a pawl carrier connected with the slide and having a sliding engagement with a fixed part; and a pawl pivotally connected with the carrier and having peripheral engagement with the dial.

7. In mechanism of the character described; an intermittently rotatable dial; a slide; a rotary shaft; a rock mechanism between said shaft and slide, whereby re ciprocatory movement is imparted to the latter in a straight line; and a pawl pivotally connect d with the slide and having peripheral engagement with the dial, the pivot mounting of the pawl being movable, in a straight path between two points that are equally distant from and upon opposite sides of the. point of intersection of an imaginary line passing through the axis of the dial at substantially a right angle to the straight line forming the path of movement of the pivot mounting and said straight line; and means for varying the length and position of the stroke of the pivot mounting relatively to said point of intersection and maintaining the limit of movement thereof equally distant from and upon opposite sides of said point of intersection.

8. In mechanism of the character described; an intermittently rotatable dial; a slide; a rotary shaft; a rock lever actuated from said shaft; a second rock lever; a link connecting said rock levers; a link between said second rock lever and slide and having an adjustable connection with each; and a pawl pivotally connected with the slide andhaving peripheral engagement with the dial.

9. In mechanism of the character described; an intermittently rotatable dial; a slide; a rotary shaft; a rock lever actuated from said shaft; a second rock lever-having a slot therein; a link connecting said rock levers; a stud adjustably mounted withinsaid slot; a link between said second rock lever and slide having connection with said stud at one end and an adjustable connection at the opposite end with the slide; and a pawl pivotally connected with the slide and having peripheral engagement with the dial 10. In mechanism of the character described; an intermittently rotatable dial; a slide; companion nuts upon said slide; a stud connected with said nuts and held against axial movement relatively thereto by said nuts; a rotary shaft; a rock lever actuated from said shaft; a second rock lever having a slot therein; a link connecting said rock levers; a stud adjustably mounted within said slot; a link between said studs having connection with said stud at one end and an adjustable connection at the opposite end with the slide; and a pawl pivotally connected with the slide and having peripheral engagement with the dial.

In testimony whereof we have hereunto affixed our signatures.

ZENAS P. CANDEE. JESSE B. BURTON. 

